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Autoclave processing of polymer- and epoxy- matrix composites

Our semi-industrial autoclave by Aeroform Limited (Poole, UK) can run simultaneous temperature/pressure/vacuum profiles within the ranges of 25 to 225°C and -1 to 10 Bar. We use the chamber to cure mainly polymer- and epoxy-matrix composites, custom laminates (eg with embedded SMA actuators) and nanocomposite materials (eg buckypapers). The autoclave's pressurized environment is also used in investigating watertightness of submersed structures. Manufacturing possibilities include Resin Film Infusion (RFI), Vacuum Bagging, Resin Transfer Infusion (RTI), Prepreg, and Wet/Hand-layup.

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Development and testing of self-deformed composites

fig research 24bA multifunctional composite without insertion of actuators can be developed by exploiting the thermal anisotropy of a composite laminate in order to induce shape changes by internal heating. Indeed a selective thermal activation of one or more layers inside the material would create thermal stresses, which could induce shape change to the material at the macroscopic level, just as those observed in the bimetallic strips.

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Ferromagnetic SMA and related composites

fig research 23aModern technologies need transducing materials, which combine large strains, high-force production and fast dynamic response during an actuation event. The functionality of these materials is based on the physical mechanisms responsible for the electric, magnetic or thermal energy transformations into mechanical work, which produce the actuation. The reverse energy conversion is in use for sensing. The efficiency, power density and speed of these types of energy conversion determine the advantages and drawbacks of these materials in the applications.

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Shape Memory Alloy (SMA) wires as activators in polymers & composites

fig research 21aThe integration of pre-strained Shape Memory Alloy wires with small diameters in fibre reinforced polymer composites leads from the engineering structural materials to the so-called adaptive or smart composite materials.

Adaptive materials integrate actuating and sensing components, which are very often totally different materials, into a structural one. These materials or material systems can vary some of their properties and/or functions, such as stiffness, damping capacity or even shape, in response to an external or internal stimulus. It is obvious that not only their overall mechanical performance, but also their adaptive functions are significantly affected by the quality of the interfacial regions between their constituents.

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